Double-Beam Axial Engine
   From the 1851 edition of the Manual of Magnetism: Horizontal Beam Axial Engine. - An instrument in which there are two horizontal beams, each connected with a bend bar moving in an upright double helix, is represent [at the right]. The motion of the beams is communicated to a single flywheel, by means of toothed wheels moved by cranks." 

   The cost was $15.00 to $18.00. This engine is in the Collection of Historical Instruments at Harvard University.

   Palmer and Hall made a later version of this apparatus, with the main difference being in the shape of the walking beams. 

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